Abdullah bin Sinan narrates: Abdullah bin Mas'ud (may Allah be pleased with him) came to announce the death of Umar (may Allah be pleased with him) and the caliphate of Uthman (may Allah be pleased with him). Abdullah (may Allah be pleased with him) said: "By Allah, we spared no effort in choosing the most excellent and best of us."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 8808